TY - JOUR AU - Pkhakadze, Sh. TI - A N. Bourbaki type general theory and the properties of contracting symbols and corresponding contracted forms. JO - Georgian Mathematical Journal PY - 1999 SP - 179 EP - 190 VL - 6 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/GMJ_1999__6_2_48315/ LA - en ID - GMJ_1999__6_2_48315 ER -